External HD will not mount

I was writing some files to my external hard drive from my MBP. I looked back at my MBP the hard drive was gone off the desktop and when I attempted to plug it back in it was not recognized. It would not mount through disk utility either. Its formatted with FAT32 and used by both my Mac and PC. Any idea how I can get this drive to work again?

What are the lights on the enclosure showing when you plug it in? Is the green "powered" light on, does it blink red for a bit (showing access) when you plug it in and does it go back to green after a while?
Does the device (as opposed to the device and volumes) show up in Disk Utility?
Does it show up on the PC?
Have you rebooted the Mac and checked the /Volumes/ folder while it's unplugged to see if there's a dead alias sitting in there?
What shows up, if anything, in System Profiler under USB/Firewire when it is plugged in?
Do other devices still work successfully on the same port?

DiskWarrior might be able to help. I had the exact same thing happen to my external drive and my buddy used diskwarrior to check the drive. We think that the interface is jacked up, so now I have to buy a new enclosure. If I was you, I would try another enclosure and then see if the same thing happens.

DiskWarrior might be able to help. I had the exact same thing happen to my external drive and my buddy used diskwarrior to check the drive. We think that the interface is jacked up, so now I have to buy a new enclosure. If I was you, I would try another enclosure and then see if the same thing happens.

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Can disk warrior repair the file system? I would really like a program that can repair the drive so it mounts. Every program I found so far just copies the files off the drive.

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